Automatic stoker



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K. JUENGLING AUTOMATIC STOKER 2 sheets-Sheet l1 Filed May 27, 1918 N VENTo@ Of V724? LILSUSE 2 Sheets-Sheet 2 MSR Apr. 17, w23.

K. F. JUENGLING AUTOMATIC STOKER Filed May 27 1918 Patented pr. B7; w23.

KL F. JUENGLING,

OF LAKEWOOD, OHEO.

AUTOMATIC STUKER.

Application led May 27,

To all lwhom it may conce/vw.

Be it known that I, KARL F. JUnNGLrNG, a citizen of the United States,and a resident of Lakewood, county of Cuyahoga, and State of Ohio, haveinvented a new and useful lmprovement in Automatic Stokers, of which thefollowing is a specification, the principle of the invention beingherein eX- plained and the best mode in which l have contemplatedapplying that principle, so as to distinguish it from other inventions.

The present improvements, relating, as indicated, to an automaticstoker, have regard moreparticularly to the provision of a selfcontained mechanism of this sort, including in a unitary structure notonly suitable grate means for burning the fuel in the furnace chamber,but also means for feeding the fuel to and advancing the same along suchgrate, and means for producing a forced draft in order to insure thethorough combustion of such fuel. A further object is to mount all theaforesaid means on a truck or like movable support, whereby themechanism as a whole may be advanced into position in the furnacechamber or withdrawn for the purpose of inspection and repair, as may bedesired. A further object is to provide an improved form of grate bar orplate, whereby the feeding of the fuel is facilitated. To theaccomplishment of the foregoing and related ends, said invention, then,consists of the means hereinafter fully described and particularlypointed out in the claims.

The annexed drawings and the following description set forth in detailcertain mechan ism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawings: f

Fig. 1 is a plan View ofa stoker embodyingr my present improvements;Fig. 2 is a side elevation and section of the same, the plane of thesection being indicated by the line 2 2 Fig. 1; and Fig. .3 is a rearelevation of said mechanism.

The stoker will be readily recognized as of the over-feed type, andfits, in the operative position shown in Figs. 1 and 2, into a suitableopening 1 in the front wall 2 of the furnace chamber, the grate 3,proper, extending rearwardly and downwardly towards the rear wall 4. Aspreviously indicated, not only such grate, but all of the 1918. SerialNo. 236,667.

various accessory parts are mounted on a frame 5, so as to form a selfcontained unit capable of being thus placed in the furnace chamber orremoved therefrom, as occasion demands. To this end, the frame ispreferably provided with rollers 6 running on rails 7 that extendlongitudinally of the chamber, such rails also serving to support theash pan or plate 8 that closes the rear of the furnace floor. Theinnermost portion of the grate is supported at a sufficient elevation topermit this plate to be drawn forwardly under the same, so that theashes and clinker that accumulate thereon may be dropped into the ashpit 9 below.

The grate proper is made up of a plurality of series of superimposedplates 10, presenting, when assembled in place, the e'ect of. a seriesof shallow steps with inclined risers. These plates are removably fittedinto suitably formed spaces between longitudinally extending members 1lof the frame, each plate holding the one below in place and the topmostof the series interlocking with the frame, so as to render accidentaldisplacement impossible. yllhe plates are supported so as to leaveopenings 12 between the lower end of each and the top of the one below,through which an air blast may be passed by the draft mechanismpresently to be described.

Before referring to the draft mechanism, however, the means forsupplying fuel to the upper portion of the grate andfor advancing orfeeding the same down to such grate will be set forth: The currentsupply is designed to be contained in a hopper 15 mounted on the frame 5so as to lie alongside the front wall 2 of the furnace chamber.

ln this hopper there works a reciprocable slide 16 ywhereby the fuel isallowed to drop onto the topmost plates 10'of the grate and is graduallyforced down over the plates. Slide 16 ispreferably movablev in the sameplane as that of the grate and is provided with a series of fingers 16athat lie between the several series of plates comprising such grate.These fingers, in other words, re'st on the frame members 11 and extenddown to a point where the coking of a bituminous coal starts, theiraction being to keep the coking coal broken up and so to reduce thetendency for building up into a large mass. lt will ordinarily bedesirable to supplement the feeding action of such slide in the bottomof the hopper and the fingers carried -thereby with a second slide 17located at an intermediate point in `each series of plates, a suitablespace 18 beingyleft for the purpose through which such slide may projectin its advanced position. The slides 16 and 17 are operated,simultaneously by the oppositely directed arms ofa double bell-crank 19that is connected to be oscillated from a drive shaft 20 mounted intransversely disposed bearings on the rear of the frame just below thehopper 1 5.

The sides and bottom of the frame are enclosedA by a suitable casing 21and the space within such casing is divided into two chambers by thepartition 22, in which the lowermost slide 17 is held, valves or gates23 and 24 being provided whereby these chambers may be more or less shutoff from the current of air supplied by the blower fan 25 mounted at therear of the frame. This' fan as shown is operated by a direct connectedsteam turbine motor 26, the exhaust 27 from which is connected with theinterior of the aforesaid casing, so that the steam is carriedalong withthe air to the grate. This construction is not essential and an electricmotor or other driving means ma be substituted to suit conditions.

he-mode of operation of my improved stoking mechanism should be readilyapparent from the foregoing description. In the first place` it will beobvious that not only the grate proper but also the' fuel feedingmechanism, as well as the blower fan, are all carried on the same frame,which, being mounted on a truck, may be easily and quickly advanced intoposition in the furnace chamber or withdrawn therefrom. This presents agreat advantage over any lconstruction at present in use, so far as I amaware, in that the necessity for a separate air conduit lea-ding to thefurnace chamber with special foundations and other complications isentirely done away with` and yet all of the advantages of a forced draftin combination with an over-feed stoker is obtained. The utilization ofthe exhaust steam from the engine that drivesthe fan also presentsobvious advantages, while not only the supply of fuel but also thedistribution of the air blast may be readily regulated. Finally,

the construction and manner of support o the grate itself, as well a`sof the ashlor clinker plate, is of special utility.

Other modes of applying the principle of my invention may be employedinstead of the `one explained, change being made as regards themechanism herein disclosed, rovided the means stated by any of the folowing claims or the equivalent of suc-h stated means be employed.

' I therefore particularly point out and distinctly claim as myinvention 1. In a self contained movable Stoker, the combination of aframe adapted to be moved into and out cfa furnace chamber, a casingenclosing the sides and bottom of said frame, a furnace grate mounted onsaid frame and sloping downwardly to the rear of said -chamber andforming with said frame and Casin a unitary movable structure, a bloweralso mounted on said frame movable therewith and connected with saidcasing so as to supply a forced draft to said grate, and means withinsaid casing for regulating the volume of the draft to the differentparts of said grate.

2. In a self contained movable stoker, the combination of a frameadapted to be moved into and out of a furnace chamber, an enclosingcasing for the sides and bottom of said frame and attached thereto andmovable therewith as a unit, a grate mounted on said frame and slopingdownwardly to the rear of said chamber, and fuel supply means mounted onsaid frame' and movable therewith. said means including a hopper and amovable slide in said hopper to discharge the fuel onto said grate. v

3. In a self contained movable stoker for furnaces, the combination witha furnace chamber, of rails extending therein, and an automatic Stokercomprising a wheeled enclosed frame supported on said rails so as to bemovable into and out of said chamber. a suitable grate and means forsupplying a blast of air to said grate, the air blast means with saidframe and grate comprising a unitarystruc-ture substantially asdescribed.

Signed by me, this 22nd dav of May. 1918.

' Y KARL F. JUENGLNG.

